Were you signed in when you submitted the ticket? If not, you won't be able to see it unfortunately >.< If you received an email from SE stating they received it, you can follow the link they give to see if it's still open (do not actually cancel it though!). If it's open, it should display the ticket number and option to cancel. If it's closed, it'll say something to reflect that (issue resolved or something). However, if you were signed in, ticket history is a link that appears below your account name (How to use this page, Square Enix ID, IDNAME, logout then below that is ticket history) on the right hand side of the screen at https://support.na.square-enix.com/

Do know though that happened to me and my account was still fixed on the ticket I was unable to view